Acceptance and commitment therapy as a web-Based intervention for depressive symptoms: Randomised controlled trial

Abstract

Background Depression is a highly prevalent disorder, causing a large burden of disease and substantial economic costs. Webbased self-help interventions seem promising in promoting mental health. Aims To compare the efficacy of a guided web-based intervention based on acceptance and commitment therapy (ACT) with an active control (expressive writing) and a waiting-list control condition (Netherlands Trial Register NTR1296). Method Adults with depressive symptoms from the general population were randomised to ACT (n = 82), expressive writing (n = 67) or waiting-list control (n = 87). The main outcome was reduction in depressive symptoms assessed with the Center for Epidemiological Studies - Depression scale. Results Significant reductions in depressive symptoms were found following the ACT intervention, compared with the control group (Cohen's d = 0.56) and the expressive writing intervention (d = 0.36). The effects were sustained at 6-month and 12-month follow-up. Conclusions Acceptance and commitment therapy as a web-based public mental health intervention for adults with depressive symptoms can be effective and applicable.